Abstract

An ecological numerical model has been developed for coastal zone management in Dokai Bay, Japan. The numerical model experiment reproduces the occurrence of red tides and oxygen-deficiency in Dokai Bay during summer. Moreover, the model experiments forecast that when the phosphorus or nitrogen load from land will be cut by 90% or 95%, respectively, red tides and oxygen-deficiency will not occur in Dokai Bay. If the sewage facility is not sufficient to cut the nutrients load to the necessary degree, it is necessary to consider other countermeasures such as cultivating bivalves in order to decrease the nutrients in the bay.

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